Lecture4_15 - 4/14/2010 Chapter 22 RNA molecules found in...

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4/14/2010 1 Chapter 22 RNA molecules found in human cells are categorized into five major types, distinguished by their function. Heterogeneous nuclear RNA (hnRNA): Formed directly by DNA transcription. Messenger RNA (mRNA): Carries instructions for protein synthesis (genetic information) from DNA Small nuclear RNA (snRNA): Facilitates the conversion of hnRNA to mRNA Ribosomal RNA (rRNA): Combines with specific proteins to form ribosomes - the physical site for protein synthesis Transfer RNA (tRNA): Delivers amino acids to the sites for protein synthesis
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4/14/2010 2 An overview of types of RNA in terms of cellular locations where they are encountered and transcription and translation processes in which they are involved. Transcription: A process by which DNA directs the synthesis of mRNA molecules Two-step process - (1) synthesis of hnRNA and (2) editing to yield mRNA molecule Gene: A segment of a DNA base sequence responsible for the production of a specific hnRNA/mRNA molecule Most human genes are ~1000
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This note was uploaded on 05/05/2010 for the course CHM 1031 taught by Professor Gow during the Spring '09 term at University of Florida.

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Lecture4_15 - 4/14/2010 Chapter 22 RNA molecules found in...

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